In a case that raises questions about online journalism and privacy rights, the U.S. Department of Justice sent a formal request to an independent news site ordering it to provide details of all reader visits on a certain day.

The grand jury subpoena also required the Philadelphia-based Indymedia.us Web site "not to disclose the existence of this request" unless authorized by the Justice Department, a gag order that presents an unusual quandary for any news organization.